package com.maozai.maozaimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.maozai.common.to.es.SkuEsModel;
import com.maozai.common.utils.R;
import com.maozai.maozaimall.search.config.MaozaimallElasticSearchConfig;
import com.maozai.maozaimall.search.constant.EsConstant;
import com.maozai.maozaimall.search.feign.ProductFeignService;
import com.maozai.maozaimall.search.service.MallSearchService;
import com.maozai.maozaimall.search.vo.AttrResponseVo;
import com.maozai.maozaimall.search.vo.BrandVo;
import com.maozai.maozaimall.search.vo.SearchParam;
import com.maozai.maozaimall.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam searchParam) {
        //1 动态构建出查询需要的DSL语句
        SearchResult result = null;
        //1 准备检索请求
        SearchRequest searchRequest = buildSearchRequest(searchParam);
        try {
            //2 执行检索请求
            SearchResponse response = client.search(searchRequest, MaozaimallElasticSearchConfig.COMMON_OPTIONS);
            //3 分析响应数据封装成我们需要的格式
            result = buildSearchResult(response, searchParam);
        } catch (IOException e) {

        }
        return result;
    }

    /**
     * 准备检索请求
     * 模糊匹配，过滤(按照属性，分类，品牌，价格区间，库存)，排序，分页，高亮，聚合分析
     * @return SearchRequest
     */
    private SearchRequest buildSearchRequest(SearchParam searchParam) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建DSL语句
        /**
         * 查询：模糊匹配，过滤(按照属性，分类，品牌，价格区间，库存)
         */
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        if (!StringUtils.isEmpty(searchParam.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", searchParam.getKeyword()));
        }
        if (searchParam.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", searchParam.getCatalog3Id()));
        }
        if (searchParam.getBrandId() != null && searchParam.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", searchParam.getBrandId()));
        }
        if (searchParam.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", searchParam.getHasStock() == 1));
        }


        if (!StringUtils.isEmpty(searchParam.getSkuPrice())) {
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = searchParam.getSkuPrice().split("_");
            if (s.length == 2) {
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if (s.length == 1) {
                if (searchParam.getSkuPrice().startsWith("_")) {
                    rangeQuery.lte(s[0]);
                }else {
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        if (searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0) {
            for (String attrStr : searchParam.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                String[] s = attrStr.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //每一个必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        if (!StringUtils.isEmpty(searchParam.getSort())) {
            String sort = searchParam.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }
        sourceBuilder.from((searchParam.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        if (!StringUtils.isEmpty(searchParam.getKeyword())) {
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        /**
         * 聚合分析
         */
        //1 品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //品牌聚合的子聚合
        TermsAggregationBuilder brand_name_agg = brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        TermsAggregationBuilder brand_img_agg = brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //2 分类聚合 catalog_agg
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        TermsAggregationBuilder catalog_name_agg = catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3 属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(attr_id_agg);

        sourceBuilder.aggregation(attr_agg);


        String s = sourceBuilder.toString();
        System.out.println(s);
        SearchRequest request = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return request;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam searchParam) {
        SearchResult result = new SearchResult();
        SearchHits hits = response.getHits();
        //1 返回的所有查到的商品
//        result.setProducts();
        List<SkuEsModel> list = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(searchParam.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                list.add(esModel);
            }
            result.setProducts(list);
        }

//        //2 当前所有商品涉及到的所有属性信息
//        result.setAttrs();
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);
            String attr_name_agg = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            List<String> attr_value_agg = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrValue(attr_value_agg);
            attrVo.setAttrName(attr_name_agg);
            attrVos.add(attrVo);

        }
        result.setAttrs(attrVos);
//        //3 当前商品所有涉及到的品牌信息
//        result.setBrands();
//
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            long brandId = bucket.getKeyAsNumber().longValue();
            String brand_img_agg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            String brand_name_agg = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandId(brandId);
            brandVo.setBrandImg(brand_img_agg);
            brandVo.setBrandName(brand_name_agg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
//        //4 当前商品所有涉及到的分类信息
//        result.setCatalogs();
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalogName = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalogName);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);
//        =====================以上从聚合信息中获取===================
//        //5 当前分页信息的页码
//        result.setPageNum();
        result.setPageNum(searchParam.getPageNum());
//        //6 当前分页信息的总记录数
//        result.setTotal();
        long total = hits.getTotalHits().value;
        result.setTotal(total);
//
//        //7 总页码
//        result.setTotalPages();
        int totalPages = ((int) total % EsConstant.PRODUCT_PAGESIZE == 0) ? ((int) total / EsConstant.PRODUCT_PAGESIZE) : ((int) total / EsConstant.PRODUCT_PAGESIZE + 1);
        result.setTotalPages(totalPages);
        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);
        //构造面包屑导航功能
        if (searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0) {
            List<SearchResult.NavVo> collect = searchParam.getAttrs().stream().map(attr -> {
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                }else {
                    navVo.setNavName(s[0]);
                }
                String replace = replaceQueryString(searchParam, attr, "attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(collect);
        }
        //品牌，分类
        if (searchParam.getBrandId() != null && searchParam.getBrandId().size() > 0) {
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //TODO 远程查询所有品牌
            R r = productFeignService.brandsInfo(searchParam.getBrandId());
            if (r.getCode() == 0) {
                List<BrandVo> brands = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brand : brands) {
                    buffer.append(brand.getName() + ";");
                    replace = replaceQueryString(searchParam, brand.getBrandId() + "", "brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
            }

            navs.add(navVo);
        }
        //TODO 分类：不需要导航需求

        return result;
    }

    private String replaceQueryString(SearchParam searchParam, String value, String key) {
        String encode = null;
        try {
            //TODO 前端和后端处理空格的方式不同，所以空格要进行特殊的处理
            //前端处理空格变成了%20 java处理空格变成了+
            encode = URLEncoder.encode(value, "UTF-8");
            //把+替换掉
            encode = encode.replace("+", "%20");

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return searchParam.get_queryString().replace("&" + key + "=" + encode, "");
    }


}
